import logging
from typing import List

from fastapi import APIRouter, Depends, Query
from sqlalchemy import select
from sqlalchemy.orm import joinedload
from sqlalchemy.ext.asyncio import AsyncSession

from app.database import get_db
from app.models import BotTrade, iso_utc
from app.schemas import BotTrade as BotTradeSchema
from app.services.signed_request import verify_signed_request_any

router = APIRouter()
logger = logging.getLogger(__name__)

ACTION_VIEW_TRADES = "view_trades"
ACTION_VIEW_USER = "view_user"


def _trade_to_schema(trade: BotTrade) -> BotTradeSchema:
    # Join against trigger_post to surface the source tag. When a trade was
    # opened by an ingested signal (VCP scanner, user's module, etc.) the
    # source reveals WHICH module produced it — critical for "is module X
    # actually making money?" attribution analysis.
    trigger_source = None
    if trade.trigger_post is not None:
        trigger_source = trade.trigger_post.source
    # Paper trades are tagged via hl_order_id at open time; that's the only
    # stable signal we have to distinguish them in aggregate views.
    is_paper = (trade.hl_order_id == "paper")
    return BotTradeSchema(
        id=trade.id,
        asset=trade.asset,
        side=trade.side,
        entry_price=trade.entry_price,
        exit_price=trade.exit_price or 0.0,
        pnl_usd=trade.pnl_usd or 0.0,
        hold_seconds=trade.hold_seconds or 0,
        trigger_post_id=trade.trigger_post_id or 0,
        opened_at=iso_utc(trade.opened_at) or "",
        closed_at=iso_utc(trade.closed_at) or "",
        trigger_source=trigger_source,
        is_paper=is_paper,
    )


@router.get("/trades", response_model=List[BotTradeSchema])
async def get_trades(
    wallet: str = Query(..., description="Wallet address (lower-cased internally)"),
    ts: int = Query(..., description="Signed timestamp (ms)"),
    sig: str = Query(..., description="EIP-191 signature"),
    limit: int = Query(default=20, ge=1, le=100),
    page:  int = Query(default=1,  ge=1),
    db: AsyncSession = Depends(get_db),
):
    wallet = wallet.lower().strip()
    verify_signed_request_any(
        actions=[ACTION_VIEW_TRADES, ACTION_VIEW_USER],
        wallet=wallet,
        timestamp_ms=ts,
        signature=sig,
        body=None,
        allow_replay=True,
    )
    offset = (page - 1) * limit
    # joinedload pulls trigger_post in the same query — avoids N+1 lookups
    # when serialising 100 trades.
    result = await db.execute(
        select(BotTrade)
        .options(joinedload(BotTrade.trigger_post))
        .where(BotTrade.wallet_address == wallet)
        .where(BotTrade.closed_at.is_not(None))
        .order_by(BotTrade.opened_at.desc())
        .offset(offset)
        .limit(limit)
    )
    trades = result.scalars().all()
    return [_trade_to_schema(t) for t in trades]